When I was discharged from the hospital, the doctor suggested that I take a nap every afternoon. I didn't think too much about this, but in hindsight I realize that this was not just a friendly suggestion. Sleeping -- and naps in particular -- were critical to my recovery.
Sleep that occurs during the day is often viewed as being a mark of laziness. Sleeping on the job is not viewed as a trait of the successful, driven employee. On many occasions, patients have admitted to me that they "sneak" naps during the day.